France Telecom

Dominique Bosc

Bernard Boutevin

Alain Rousseau

Martine Guilbert

Franck Foll

Bruno Vinouze

Pierre Benech

Nicole Devoldere

Julienne Liang

Alain Morand

Christian Toinen

Sma&iuml;l Tedjini

Bertrand Loisel

A Pockels-effect electro-optical modulator including a light guide having a core made of an inorganic amorphous material, and on which a structure is superposed that is made up of two electrode-forming layers between which an electro-optical polymer is interposed, said modulator being characterized in that said structure is superposed directly on the material of the core of the light guide. The transitions between the active and passive zones are advantageously adapted to minimize losses.

Hybrid integrated electro-optical modulator of the pockels effect type

This invention relates to a directional optical coupler including at least two optical guide cores (26, 28), in silica, lying on a cladding (24) in a mineral dielectric material, and a covering layer (30) in a polymer material, which covers the two optical guide cores, and whose index is less than that of the optical guide cores.

Mixed silica/polymer active directional coupler, in integrated optics

The invention relates to a crosslinkable material containing a polymer onto which chromophores are laterally grafted, characterized in that each chromophore is within a polymer unit which corresponds to the following formula (I): ##STR1## in which: X represents a part of the polymer chain,

Crosslinkable material which may be used in opto-electronics, process

A liquid crystal display screen which includes a first transparent plate covered with an electrode array and a second transparent plate covered with a counter-electrode. A liquid crystal film is inserted between the first and second plates. Further, either of the first or second transparent plates is covered with a material coating which diffuses ambient light with a brightness which exceeds a brightness of the liquid crystal film in the absence of excitation. This coating may take the form of a metal, a white mineral pigment or a polymer film which contains surface microcracks. Such a liquid crystal display screen as in the present invention may find particular applications to terminals, computers, pocket calculators, etc.

Diffusing matrix liquid crystal display screen

The invention relates to a crosslinkable material that is active in non-linear optics, containing a polymer which carries chromophores each included in a polymer unit of formula: ##STR1## in which: T is part of the polymer chain,

Crosslinkable polymer material which may be used in non-linear optics

The invention relates to a process for manufacturing a monomode cylindrical optical waveguide made of a polymer and endowed with electrooptic properties. According to the invention, the manufacturing process comprises the following steps:

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Lannion, France

Dominique Bosc